Code One Magazine: The X Planes, X-15

X-15
Mission: The X-15 was built specifically to explore the hypersonic (Mach 5-plus) speed regime at extremely high altitudes. It is arguably the most successful high-performance research aircraft program in history. In its final version, the X-15 was powered by a single Reaction Motors Inc. XLR99 rocket engine.

Manufacturer: North American Aviation
Number Built: 3
Sponsor: USAF, NACA, NASA, USN
Fastest Flight: 4,104 mph
Highest Flight: 314,750 feet
First Flight: 8 June 1959
Last Flight: 24 October 1968
Total Flights: 177
Length: 50 feet 3 inches (XLR99)
Wingspan: 22 feet 4 inches
Height: 11 feet 7.6 inches
Gross Weight: 31,275 lb

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